To provide a system not requiring a visitor to a group to go to or phone the group, and allowing the group side to easily update notification information such as a coping-possible date.

A server device 10 has a notification information DB 11, a notification information registration means 12, a notification information update means 13, and a notification information browsing means 14. The notification information registration means 12 registers the notification information and group information of the group into the notification information DB 11 in response to a notification information registration request from a client device 3 for a belonging person via the Internet 2. The notification information update means 13 updates the notification information stored in the notification information DB 11 in response to a notification information update request from the client device 3 for the belonging person via the Internet 2. The notification information browsing means 14 makes a client device 4 for the visitor browse the notification information read from the notification information DB 11 via the Internet 2 in response to a browsing request from the client device 4 for the visitor via the Internet.